Primerless HTV silicone rubber

Abstract

The present invention provides a curable elastomeric composition which is capable of being applied to the surface of an article without treatment of the surface with a primer. The curable elastomeric composition of the invention includes a curable elastomer, a metal salt of an ethylenically unsaturated carboxylic acid, a trifunctional acrylate, and an organic organic peroxide. Moreover, the curable elastomeric composition may further include one or more additives such as polydiorganosiloxane polymer fluids, UV stabilizers, flame retardants, fillers, and pigments. The present invention also provides a method of coating an article with the elastomeric composition of the invention without the need to pretreat the article with a primer.

1 . A curable elastomeric composition comprising: 
 a curable elastomer;    a metal salt of an ethylenically unsaturated carboxylic acid;    a trifunctional acrylate monomer; and    an organic peroxide.    
   
   
       2 . The curable elastomeric composition of  claim 1  wherein the curable elestomer is selected from the group consisting of synthetic silicone elastomers, polyisoprene, styrenebutadiene rubbers, polybutadiene rubbers, butyl rubber, bromobutyl rubber, cholorobutyl rubber, the neoprenes, ethylene propylene rubbers, nitrile elastomers, fluoroelastomers, high styrene butadiene copolymers, vinyl acetate ethylene copolymers, chlorinated polyethylene rubber, chlorosulfonated polyethylene elastomer, polyethylene, reclaimed rubber, and natural rubber.  
   
   
       3 . The curable elastomeric composition of  claim 1  wherein the metal salt of an ethylenically unsaturated carboxylic acid is a metal salt of an α, β-ethylenically unsaturated carboxylic acid.  
   
   
       4 . The curable elastomeric composition of  claim 1  wherein the metal salt of an ethylenically unsaturated carboxylic acid is a metal salt of acrylic acid.  
   
   
       5 . The curable elastomeric composition of  claim 4  wherein the metal salt of an ethylenically unsaturated carboxylic acid is selected from the group consisting of calcium diacrylate, magnesium diacrylate, zinc diacrylate, and combinations thereof.  
   
   
       6 . The curable elastomeric composition of  claim 4  wherein the metal salt of an ethylenically unsaturated carboxylic acid comprises zinc diacrylate.  
   
   
       7 . The curable elastomeric composition of  claim 1  wherein the metal salt of an ethylenically unsaturated carboxylic acid is a metal salt of methacrylic acid.  
   
   
       8 . The curable elastomeric composition of  claim 7  wherein the metal salt of an ethylenically unsaturated carboxylic acid comprises zinc dimethacrylate.  
   
   
       9 . The curable elastomer composition of  claim 1  wherein the trifunctional acrylate monomer comprises a trimethylolpropane triacrylate.  
   
   
       10 . The curable elastomeric composition of  claim 9  wherein the trifunctional acrylate monomer is selected from the group consisting of an ethoxylated trimethylolpropane triacrylate, a propoxylated trimethylolpropane triacrylate, and combinations thereof.  
   
   
       11 . The curable elastomeric composition of  claim 9  wherein the trifunctional acrylate monomer comprises trimethylolpropane trimethacrylate.  
   
   
       12 . The curable elastomer composition of  claim 9  wherein the trifunctional acrylate monomer is selected from the group consisting of a propoxylated glyceryl triacrylate, a trimethylolpropane triacrylate, tris (2-hydroxy ethyl) isocyanurate triacrylate, tris (2-hydroxy ethyl) isocyanurate triacrylate, pentaerythritol triacrylate, and combinations thereof.  
   
   
       13 . The curable elastomer composition of  claim 1  wherein: 
 the curable elastomer is present in an amount from about 50% to about 99.8% of the combined weight of the curable elastomer, the metal salt of an ethylenically unsaturated carboxylic acid, the trifunctional acrylate, and the organic organic peroxide;    the metal salt of an ethylenically unsaturated carboxylic acid is present in an amount from about 0.05% to about 30% of the combined weight of the curable elastomer, the metal salt of an ethylenically unsaturated carboxylic acid, the trifunctional acrylate, and the organic peroxide;    the trifunctional acrylate monomer is present in an amount from about 0.05 to about 10% of the combined weight of the curable elastomer, the metal salt of an ethylenically unsaturated carboxylic acid, the trifunctional acrylate, and the organic organic peroxide; and    the organic peroxide is present in an amount from about 0.1 to about 10% of the combined weight of the curable elastomer, the metal salt of an ethylenically unsaturated carboxylic acid, the trifunctional acrylate, and the organic organic peroxide.    
   
   
       14 . An article coated with the curable elastomer composition of  claim 1 .  
   
   
       15 . A cured elastomer made from the curable elastomer composition of  claim 1 .  
   
   
       16 . A method of coating an article with an elastomer comprising applying the composition of  claim 1  to the article.  
   
   
       17 . A curable elastomeric composition comprising: 
 a curable silicone elastomer;    a metal salt of an ethylenically unsaturated carboxylic acid;    a trimethylolpropane triacrylate; and    an organic peroxide.    
   
   
       18 . The curable elastomeric composition of  claim 17  wherein the metal salt of an ethylenically unsaturated carboxylic acid is a metal salt of acrylic acid.  
   
   
       19 . The curable elastomeric composition of  claim 18  wherein the metal salt of an ethylenically unsaturated carboxylic acid is a selected from the group consisting of calcium diacrylate, magnesium diacrylate, zinc diacrylate, and combinations thereof.  
   
   
       20 . The curable elastomeric composition of  claim 18  wherein the metal salt of an ethylenically unsaturated carboxylic acid comprises zinc diacrylate.  
   
   
       21 . The curable elastomeric composition of  claim 17  wherein the metal salt of an ethylenically unsaturated carboxylic acid is a metal salt of methacrylic acid.  
   
   
       22 . The curable elastomeric composition of  claim 21  wherein the metal salt of an ethylenically unsaturated carboxylic acid comprises zinc dimethacrylate.  
   
   
       23 . The curable elastomeric composition of  claim 17  wherein the a trimethylolpropane triacrylate is selected from the group consisting of an ethoxylated trimethylolpropane triacrylate, a propoxylated trimethylolpropane triacrylate, and combinations thereof.  
   
   
       24 . The curable elastomeric composition of  claim 17  wherein the trimethylolpropane triacrylate comprises trimethylolpropane trimethacrylate.  
   
   
       25 . The curable elastomer composition of  claim 17  wherein: 
 the curable elastomer is present in an amount from about 50% to about 99.8% of the combined weight of the curable elastomer, the metal salt of an ethylenically unsaturated carboxylic acid, the trifunctional acrylate, and the organic organic peroxide;    the metal salt of an ethylenically unsaturated carboxylic acid is present in an amount from about 0.05% to about 30% of the combined weight of the curable elastomer, the metal salt of an ethylenically unsaturated carboxylic acid, the trifunctional acrylate, and the organic peroxide;    the trifunctional acrylate monomer is present in an amount from about 0.05% to about 10% of the combined weight of the curable elastomer, the metal salt of an ethylenically unsaturated carboxylic acid, the trifunctional acrylate, and the organic peroxide; and    the organic peroxide is present in an amount from about 0.1% to about 10% of the combined weight of the curable elastomer, the metal salt of an ethylenically unsaturated carboxylic acid, the trifunctional acrylate, and the organic organic peroxide.    
   
   
       26 . An article coated with the curable elastomer composition of  claim 17 .  
   
   
       27 . A cured elastomer made from the curable elastomer composition of  claim 17 .  
   
   
       28 . A method of coating an article with an elastomer comprising applying the composition of  claim 17  to the article.  
   
   
       29 . A method of coating an article with an elastomer comprising: 
 a) applying a curable elastomeric composition to at least a portion of a surface of the article to form a uncured coated article, the curable elastomeric composition comprising:    a curable elastomer;    a metal salt of an ethylenically unsaturated carboxylic acid present;    a trifunctional acrylate monomer; and    an organic peroxide; and    b) curing the uncured coated article to form a cured coated article.    
   
   
       30 . The method of  claim 29  wherein the curable elastomeric composition is applied to the article by injection molding.  
   
   
       31 . The method of  claim 29  wherein the metal salt of an ethylenically unsaturated carboxylic acid is a metal salt of acrylic acid.  
   
   
       32 . The method of  claim 31  wherein the metal salt of an ethylenically unsaturated carboxylic acid is selected from the group consisting of calcium diacrylate, magnesium diacrylate, zinc diacrylate, and combinations thereof.  
   
   
       33 . The curable elastomeric composition of  claim 30  wherein the metal salt of an ethylenically unsaturated carboxylic acid comprises zinc diacrylate.  
   
   
       34 . The method of  claim 29  wherein the metal salt of an ethylenically unsaturated carboxylic acid is a metal salt of methacrylic acid.  
   
   
       35 . The curable elastomeric composition of  claim 34  wherein the metal salt of an ethylenically unsaturated carboxylic acid comprises zinc dimethacrylate.  
   
   
       36 . The curable elastomeric composition of  claim 17  wherein the a trimethylolpropane triacrylate is selected from the group consisting of trimethylolpropane triacrylate, an ethoxylated trimethylolpropane triacrylate, a propoxylated trimethylolpropane triacrylate, and combinations thereof.